Make mashed potatoes how ever you like to make them, real or instent doesn't matter.
Boial your hot dogs untill they are done and then split them with out cutting all the way through.
Put the hot dogs on a cookie sheet that has a little edge around it.
Spoon the mashed potatoes ontop of the hot dogs.
Then put a pice of american cheese ontop of the potatoes.
Then place the pan in the oven just long enough to melt the cheese.